Users with same name

We are developing an application using Oracle and, for some reason, all the developers have to use the same Oracle username, just like "developer". During the process of coding, we often get some trouble from deadlock and need to kill the session that holds the lock. When we use the Session Monitor in SQL*DBA we find all the usernames to be the same, so although we know which client PC is the locker, we don't know which session is the relative one.
Is there any way that can distinguish the client PCs with the same Oracle username? We have Oracle V7.2 and the environment of client PC is Windows3.1.

Thanks in Advance.

Frank Feng

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